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Students are given the formula of two different types of chlorophyll. Students name all the elements present, and how the number of atoms differs between the chlorophylls.

Students use the periodic table and their own knowledge to complete the types of atoms present, and total number of atoms present for three compounds.

Students use diagrams to answer questions about atoms, elements, compounds, and mixtures. They are then asked to use these words to describe the differences between diagrams.